/**
 * The MIT License
 *
 * Copyright (c) 2010 Benjamin Klum
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package org.helgoboss.executable_manager_ref_impl

import org.osgi.framework.{BundleActivator, BundleContext}
import org.helgoboss.osgi_additions.{OsgiContext, OsgiLogging, OsgiProvider}
import java.io.{InputStream, FileOutputStream, IOException, File}
import org.helgoboss.win32_facade.{Win32Facade, PathScope}
import scala.collection.JavaConversions._
import org.helgoboss.executable_manager.ExecutableManager

object ExecutableManagerRefImpl {
    val ExecutablesDir = new File(System.getProperty("user.home") + "/.executable-manager/bin")
}

class ExecutableManagerRefImpl extends OsgiContext with OsgiLogging with OsgiProvider {
    
    import ExecutableManagerRefImpl._
    
    whenBundleActive {
        onStart {
            /* Make sure executable path exists */
            
            if (!ExecutablesDir.exists) {
                ExecutablesDir.mkdirs
            }
            
            
            /* Make sure it is on path */
            
            val executablesPathComponent = ExecutablesDir.getCanonicalPath
            
            val os = System.getProperty("os.name")
            
            if (os.startsWith("Windows")) {
                val currentPathComponents = Win32Facade.getPathVariableComponents(PathScope.USER)
                
                if (!currentPathComponents.contains(executablesPathComponent)) {
                    Win32Facade.addToPathVariable(PathScope.USER, executablesPathComponent)
                }
            } else {
                /* TODO */
            }
        }
        executableManager.providesService[ExecutableManager]
    }
    
    lazy val executableManager = new ExecutableManager {
        def installExecutable(fileName: String, inputStream: InputStream) {
            val file = new File(ExecutablesDir, fileName)
            val outputStream = new FileOutputStream(file)
            try {
                val buffer = new Array[Byte](0xFFFF)
                var eof = false
                while (!eof) {
                    val length = inputStream.read(buffer)
                    if (length == -1) {
                        eof = true
                    } else {
                        outputStream.write(buffer, 0, length)
                    }
                }
            } finally {
                outputStream.close
                inputStream.close
            }
            file.setExecutable(true)
        }
        
        def removeExecutable(fileName: String) {
            val file = new File(ExecutablesDir, fileName)
            if (file.exists) {
                file.delete
            }
        }
        
        def executableExists(fileName: String) = {
            val file = new File(ExecutablesDir, fileName)
            file.exists
        }
    }
    
    
}